TM 5-6350-275-24&P
3-27. REPLACE PMC COMMUNICATIONS CABINET 12 VDC POWER SUPPLY. (Figure 3-33 and 3-34).
This task consists of:
a. Remove
b. Install
INITIAL SETUP:
Tools:
Equipment Condition:
Screwdriver, Flat tip (Item 6, App B)
PMC cabinet doors open
Screwdriver, Flat tip (Item 7, App B)
Wire Cutters (Item 24, App B)
General Safety Instructions:
Remove all jewelry while working on
Materials/Parts:
equipment.
12 vdc Power Supply 5105-E05
Wear ESD wriststrap while handling electronic
assemblies.
WARNING
When working on high-voltage components, always have an additional person present, and keep one hand
away from equipment to reduce hazard of current flowing through vital organs of body. Remove all
jewelry from fingers, wrists, and neck before working on electrical components. Failure to do so may
result in serious injury or death.
Shut off power source before attempting to disconnect, service, or connect wires or cables. Failure to do
so may result in serious injury or death.
To avoid personal injury, use an adequate number of personnel to lift or move equipment weighing over
50 pounds or oversize equipment. Observe correct lifting techniques. Failure to do so may result in
serious injury or death.
a. Removal
(1) Place power supply A switch (Figure 3-33, 2) and power supply B switch (Figure 3-33, 4) to off.
(2) Open rear door on PMC cabinet #B and remove power supply ac power cord from ac power source.
(3) Remove protective cover (5) by removing four screws (6) holding cover to standoffs (7). (Ref. Fig. 3-34)
(4) Tag and remove wires from power supply input terminal power block. (Item 13)
(5) Tag and remove wires from TB (Item 12) for power supply being replaced.
(6) Remove tie down straps holding input/output wiring to power supply.
(7) Remove four screws (8), washers (9), and nuts (10) holding power supply to front panel assembly (11).
(8) Remove power supply from cabinet #B.
3-101
